I believe the Flak Jacket perk needs a serious nerf because, I am shooting right next to people with an RPG on HC TDM and they aren't dying all because they have a Flak Jacket. Another time I threw a Semtex right at someone's feet and it blew up and they didn't die all because they had Flak Jacket. Has anyone else had problems like these?

it wouldnt be much of a perk if you died from explosives like everyone else not wearing a flak jacket.

Flak jacket doesnt work against direct hits, It just makes you take less damage from explosions that are a short distance or further away. if you get stuck with a sticky, your dead, if a nade lands at your feet - your dead. I think it works nicely as it should.